Flexo-dielectro-optical spectroscopy of PDLC films modified by nano-rubbed PTFE layers

INERA Conference 2015: Light in Nanoscience and Nanotechnology

Popova, Lidia T.^1

Georgi Nadjakov Institute of Solid State Physics, Bulgarian Academy of Sciences, 72 Tzarigradsko chaussee, Sofia

1784, Bulgaria^1

关键词: Alternating current;    Amplitude frequency;    Frequency spectra;    Liquid crystal E7;    Optical spectroscopy;    Polymer dispersed liquid crystals;    Rubbing direction;    Second harmonics;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/682/1/012027/pdf
DOI  :  10.1088/1742-6596/682/1/012027

来源: IOP

【 摘 要 】

The electro-optical (EO) response of planar single layers of polymer-dispersed liquid crystal (PDLC) composites of relatively large nematic microdroplets modified by layers of teflon (PTFE), was studied. The PDLC films were prepared from liquid crystal E7 and photopolymer NOA-65 in cells assembled with parallel or orthogonal PTFE-covered glass plates. The influence of nanostructured PTFE polymer nanolayers on both the polarized and depolarized component of laser light transmitted through PDLC cells of both geometry of layer rubbing directions was determined. Flexo-dielectro-optical spectroscopy in the range of 10 Hz - 1 kHz was applied to examine the amplitude-frequency EO modulation by PTFE-modified PDLCs in dependence on the applied alternating-current electric field. Specific fall-downs in the frequency spectra of the first and second harmonic EO modulation by PTFE-modified PDLCs were observed, that could be tuned by the driving electric field.